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PRECISION TIG 375

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CLAMPING  PROCEDURE  FOR
1/4-28 BOLTS.

Note:

This  procedure  can  only  be  used

with 1/4-28 bolts.

Do  not  use  bolts  with  any  other  type

thread or new SCR will be damaged.

Do not over tighten cap screws. The leaf

spring  will  apply  the  required  clamping

force to the SCR.

1.

Do  not  turn  the  nuts.  While  holding

the  nuts  stationary,  turn  the  cap

screws only with the following proce-

dure.

2.

Tighten first cap screw 1/4 turn.

3.

Tighten second cap screw 1/2 turn.

4.

Tighten first cap screw 1/2 turn.

5.

Tighten second cap screw 1/2 turn.

6.

Tighten first cap screw 1/4 turn.

7.

Assembly now has proper clamping

force.

8.

Perform the 

Active SCR Test.

CLAMPING  PROCEDURE  FOR
1/4-20 BOLTS.

Note:

This  procedure  can  only  be  used

with 1/4-20 bolts.

Do  not  use  bolts  with  any  other  type

thread or new SCR will be damaged.

Do not over tighten cap screws. The leaf

spring  will  apply  the  required  clamping

force to the SCR.

1.

Do  not  turn  the  nuts.  While  holding

the  nuts  stationary,  turn  the  cap

screws only with the following proce-

dure.

2.

Tighten first cap screw 1/4 turn.

3.

Tighten second cap screw 1/2 turn.

4.

Tighten first cap screw 1/2 turn.

5.

Tighten second cap screw 1/4 turn.

STOP.

6.

Assembly  now  has  the  proper

clamping force.

7.

Perform the 

Active SCR Test

.

SCR REMOVAL AND REPLACEMENT (CONTINUED)

TROUBLESHOOTING & REPAIR

Содержание Precision TIG 375

Страница 1: ...Safety Depends on You Lincoln arc welding and cutting equipment is designed and built with safety in mind However your overall safety can be increased by proper installation and thoughtful operation o...

Страница 2: ...INJURY OR DEATH KEEP CHILDREN AWAY PACEMAKER WEARERS SHOULD CONSULT WITH THEIR DOCTOR BEFORE OPERATING Read and understand the following safety highlights For additional safety information it is stron...

Страница 3: ...es from sparks and the rays of the arc when welding or observing open arc welding Headshield and filter lens should conform to ANSI Z87 I standards 4 b Use suitable clothing made from durable flame re...

Страница 4: ...that welding sparks and hot materials from welding can easily go through small cracks and openings to adjacent areas Avoid welding near hydraulic lines Have a fire extinguisher readily available 6 b W...

Страница 5: ...onnel travaillant proximit au soudage l aide d crans appropri s et non inflammables 4 Des gouttes de laitier en fusion sont mises de l arc de soudage Se prot ger avec des v tements de protection libre...

Страница 6: ...ion C Maintenance Section D Theory of Operation Section E Troubleshooting and Repair Section F How to Use Troubleshooting Guide F 2 PC Board Troubleshooting F 3 Troubleshooting Guide F 4 Test Procedur...

Страница 7: ...Ranges A 3 Safety Precautions A 4 Stacking A 4 Lifting and Moving A 4 Tilting A 4 High Frequency Interference Protection A 4 Input Electrical Connections A 5 Ground Connection A 5 Output Cables Connec...

Страница 8: ...Power 40 AC DC Stick Balance TIG Unbalance 70 Penetration AC TIG 60 AC DC Stick Balance TIG Unbalance 70 Penetration AC TIG 100 AC DC Stick Balance TIG Unbalance 70 Penetration AC TIG Idle Amps Rated...

Страница 9: ...lance Penetration with out Standard Power Factor Correction Capacitors Based on the 1999 U S National Electrical Code RECOMMENDED INPUT WIRE AND FUSE SIZES Input Voltage phase Frequency 208 1 60 230 1...

Страница 10: ...N ENVIRONMENTAL RATING Precision TIG 375 power sources carry an IP21S Environmental rating They are rated for use in damp dirty rain sheltered environments HIGH FREQUENCY INTERFERENCE PROTECTION The f...

Страница 11: ...n the welder is enclosed in a metal building several earth driven electrical grounds as in 5 above around the periphery of the building are rec ommended Failure to observe these recommended installati...

Страница 12: ...ange this con nection designations on the reconnect panel LOW MID and HIGH correspond to the name plated input voltages of a triple voltage welder Dual voltage welders use only LOW and HIGH EXAMPLE On...

Страница 13: ...be damaged Never allow the torch to touch the cylinder Keep cylinder away from live electrical cir cuits Maximum inlet pressure 150 psi The Precision TIG machines do not have Hi Freq available at the...

Страница 14: ...pumps and large motors have starting currents which are significantly higher than their running current These higher starting currents may cause the circuit breaker to open See next paragraph Both the...

Страница 15: ...am The robotic interface functions with the Precision TIG set to either TIG or STICK mode but must be in REMOTE switch position for the Preset Control inter face to function When in the REMOTE positio...

Страница 16: ...0 NOTES PRECISION TIG 375 A 10 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master T...

Страница 17: ...3 Controls and Settings B 4 Welding Operation B 5 B 8 Internal Set Up Controls B 9 2 Step Trigger Modes B 10 4 Step Trigger Modes B 11 TIG Weld Cycle Chart B 12 Set Up for TIG Amptrol Welding B 13 Ma...

Страница 18: ...s AC DC Stick SMAW capability with adjustable Arc Force availability A TIG Pulse Panel Power Factor Capacitors and a Water Solenoid are available as field installed optional kits Also a new Undercarri...

Страница 19: ...257 series cannot be used for torch connection PRECISION TIG 375 CODES ABOVE 11000 RECOMMENDED EQUIPMENT INTERFACE TIG water cooled TIG air cooled Machine PT375 Welding Package K2624 1 PT375 K2622 1 2...

Страница 20: ...position No panel light When the Polarity Switch is set to AC the TIG mode provides continuous high frequency to stabi lize the arc for AC TIG welding Hi Freq turns on after preflow time with the arc...

Страница 21: ...TE posi tion this knob sets the maximum welding level that the Peak output can be set with the remote Amptrol The new MicroStartTM Technology minimum current circuit provides for low end welding down...

Страница 22: ...n 5 0 1 2 3 4 5 Description HS TIG Hot Start of output setting 0 Only setting for SS0 above 10 20 30 40 50 60 70 80 90 UP Upslope Time None Only setting for SS1 SS2 above 0 5 sec 1 0 sec 1 5 sec 2 0 s...

Страница 23: ...et receptacle is provided for the connection of an Amptrol or other remote control See Figure B 2 When the Current Control Switch See Item 5 is in the REMOTE position the Amptrol or other remote 10K p...

Страница 24: ...ined by the SPOT TIME control A red panel light is ON to indicate SPOT mode 14 PULSE FREQUENCY CONTROL This knob is used to set the Pulse Frequency over the peak pulse range of about 0 1 pps to 20 pps...

Страница 25: ...00 Prevents stubbing of the electrode by providing extra output current if the arc voltage drops below the level required to sustain the welding arc High 65 and Low 12 factory set levels are selectabl...

Страница 26: ...put Current Gas Pre Flow Post Flow Normal Sequence Torch Button Output Current Gas Pre Flow Post Flow START CRATER CURRENT UP SLOPE DOWN SLOPE With DIP Switch 2 OFF With DIP Switch 2 ON As Shipped Act...

Страница 27: ...ly end down slope and maintain crater current Hold the trigger for more than 1 second to activate the restart function When the trigger is released up slope will occur Hold the first trigger pull to m...

Страница 28: ...ope Time DOWNSLOPE Adjust 0 10 sec w Advan Panel Fixed 0 sec w o POSTFLOW Adjust 2 60 sec or x2 CRATER FILL LEVEL Advanced Panel Select Mach Min or MIN Setting as w o Panel With PULSE ON No Pulsing Du...

Страница 29: ...output level FIGURE B 6 A Ad dv va an nc ce ed d P Pa an ne el l C Co on nt tr ro ol ls s SETUP GUIDELINES FOR TIG WELDING WITH AN AMPTROL Both the Hand and Foot Amptrols work in a similar manner The...

Страница 30: ...gsten in AC and DC applications Balanced Wave Unbalanced Wave requires derating of the electrode MAKING A TIG WELD WITH AN AMPTROL 1 Install welding equipment per Section A 5 2 Setup controls per Sect...

Страница 31: ...TABLE OF CONTENTS ACCESSORIES Accessories Section C Optional Equipment for Codes Above 11000 C 2 Optional Equipment for Codes Below 11000 C 3 Return to Master TOC Return to Master TOC Return to Master...

Страница 32: ...oolant inlet and cooler receptacle of Precision TIG Cannot be used with a water cooler K870 Foot Amptrol Single pedal foot activation of arc start switch and output control with 25 plug cable K870 1 S...

Страница 33: ...ed in the package K1828 1 Under Cooler Cart Includes a cooler in a drawer with hoses and a lockable storage drawer on a dual bottle undercar riage see below K1869 1 Undercarriage Includes a dual bottl...

Страница 34: ...4 NOTES C 4 PRECISION TIG 375 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TO...

Страница 35: ...tions D 2 Routine and Periodic Maintenance D 2 Overload Protection D 2 Service Procedures D 3 Component Location and Access D 3 Spark Gap Adjustment D 3 Under Cooler Service D 3 Major Component Locati...

Страница 36: ...the machine with the cooling air The cooling fan will oper ate briefly when the machine power is initially turned on and continuously while the yellow Thermal Shutdown Light is lit see Thermostatic P...

Страница 37: ...less high frequency is desired the setting can be reduced to 0 008 inches 0 2 mm Use extreme caution when working with the high frequency circuit The high voltages developed can be lethal Turn the in...

Страница 38: ...n TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC 1 Case Front Assembly 2 Arc Starter and Bypass Assembly 3 Case Bac...

Страница 39: ...1 X2 AC AC DC DC SHUNT CHOKE HIGH FREQUENCY TRANSFORMER HIGH VOLTAGE TRANSFORMER THERMOSTAT 115 VAC 115 VAC 115 VAC FANS GATE LEADS FEEDBACK GAS SOLENOID 115 VAC 115 VAC LED s THERMOSTATS 20 VAC 20 VA...

Страница 40: ...ow of shielding gas It features a stick output terminal front and a universal Tig torch connection box rear for simultaneous but separate electrode outputs INPUT POWER CIRCUIT The desired single phase...

Страница 41: ...mer and the cooling fan The advanced control panel also plugs into and interfaces with the control board THEORY OF OPERATION FIGURE E 3 OUTPUT RECTIFICATION CONTROL BOARD AND FEEDBACK POWER SWITCH REC...

Страница 42: ...NIMUM OUTPUT CONTROL MAXIMUM OUTPUT CONTROL PROTECTION BOARD REMOTE RECEPTACLE METER STICK TIG SWITCH BALANCE CONTROL POST FLOW LOCAL REMOTE SWITCH Precision Tig 375 FROM CONTROL BOARD X3 STICK OCV BO...

Страница 43: ...OWER FACTOR POLARITY SWITCH BYPASS BOARD WORK FRONT ELECTRODE REAR ELECTRODE 78 VAC X1 X2 AC AC DC DC SHUNT CHOKE HIGH FREQUENCY TRANSFORMER HIGH VOLTAGE TRANSFORMER THERMOSTAT 115 VAC 115 VAC 115 VAC...

Страница 44: ...rminals The bypass board protects the internal circuitry from interference THEORY OF OPERATION FIGURE E 7 AC WELDING OUTPUT POWER SWITCH RECONNECT PANEL OPTIONAL POWER FACTOR POLARITY SWITCH BYPASS BO...

Страница 45: ...t of current into the gate This gate pulse must be more positive than the cathode voltage Since there is a standard PN junction between gate and cathode the voltage between these terminals must be sli...

Страница 46: ...L PROTECTION This welder has thermostatic protection from excessive duty cycles overloads loss of cooling and excessive ambient temperatures When the welder is subjected to an overload or inadequate c...

Страница 47: ...cal Output Voltage Waveform AC Tig Mode F 40 Typical AC Voltage Waveform 50 AMPS AC Tig Mode F 41 Typical AC Voltage Waveform 2 AMPS AC Tig Mode F 42 Typical Output Voltage Waveform 200 AMPS DC Tig Mo...

Страница 48: ...te to the machine symptom Perform these tests checks in the order listed In general these tests can be conducted without removing the case wrap around cover Step 3 RECOMMENDED COURSE OF ACTION The las...

Страница 49: ...the PC Board can t be installed immediately put it back in the static shielding bag If the PC Board uses protective shorting jumpers don t remove them until installation is complete If you return a P...

Страница 50: ...re you proceed Call 1 888 935 3877 PROBLEMS SYMPTOMS POSSIBLE AREAS OF MISADJUSTMENT S RECOMMENDED COURSE OF ACTION OUTPUT PROBLEMS The machine is dead No weld out put no 115 VAC at the receptacle 1 C...

Страница 51: ...1 Check for loose or faulty connec tions on the heavy current carry ing leads Polarity switch output choke output terminals etc 2 Check for faulty connections or a defective thermostat Check leads 213...

Страница 52: ...ght is off 2 The air louvers may be blocked Remove the air obstruction and allow the unit to cool 1 One of the thermostats may be faulty Check or replace See the Wiring Diagram 2 Check for loose or fa...

Страница 53: ...of the heavy current carrying leads 3 Perform the SCR Bridge Test 4 Perform the T1 Transformer Test 5 Check the output current con trols for proper operation Normal resistance is 10 000 ohms See the W...

Страница 54: ...ng in the TIG mode the remote control device may be defective 1 Perform the SCR Bridge Test 2 Perform the T1 Transformer Test 3 Check the output current con trols for proper operation Normal resistanc...

Страница 55: ...inal insu lators for cracks or signs of over heating 1 Diode D1 may be shorted Check and replace if necessary 2 Check the polarity switch S2 for proper function and correct con nections 3 Perform the...

Страница 56: ...nterference Make sure that the machine is grounded properly according to the installation instructions If there are other high frequency sources in the area make cer tain that they are grounded prop e...

Страница 57: ...e control board 1 Check the high voltage trans former T2 The normal resis tance of the secondary winding is 12 5k ohms ELECTRIC SHOCK CAN KILL When 115 VAC is applied to T2 a very high voltage is deve...

Страница 58: ...1 The spark gap may be too large Check and reset per instructions in the Maintenance Section of this manual 2 The work and or torch cables may be in poor condition allow ing the high frequency to lea...

Страница 59: ...may be a welding proce dure problem When AC TIG welding the arc is erratic and there is a loss of clean ing of the work piece 1 The tungsten electrode may be small for the process Use a larg er diame...

Страница 60: ...Jumper in connector J 3 If the machine functions normally the Advanced Process panel or harness is defective 1 Welding current may be too high for the electrode size Reduce current control setting or...

Страница 61: ...nel or harness is defective 1 Check that either the advanced control board or jumper plug is in J3 on the control board 1 Check R1 potentiometer and associated leads between the control board and plug...

Страница 62: ...for electrical troubleshooting assistance before you proceed Call 1 888 935 3877 PROBLEMS SYMPTOMS POSSIBLE AREAS OF MISADJUSTMENT S RECOMMENDED COURSE OF ACTION FUNCTION PROBLEMS The meter does not...

Страница 63: ...ch set ting on the board See Installation Manual 1 Check plug J3 on the control board Either the jumper plug or the advanced control board must be plugged into J3 TROUBLESHOOTING REPAIR TROUBLESHOOTIN...

Страница 64: ...8 NOTES F 18 PRECISION TIG 375 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master T...

Страница 65: ...u do not understand the test procedures or are unable to perform the test repairs safely contact the Lincoln Electric Service Department for electrical trou bleshooting assistance before you proceed C...

Страница 66: ...the Mode Switch to the TIG mode and without closing the arc start switch preset the panel maxi mum output control so the panel digital meter reads 200 amps 2 Using a DC avg digital test voltmeter wit...

Страница 67: ...X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X DZ16 C47 R274 D58 R93 D21 X11 D65 C106 C35 Q17 D80 Q23 Q14 C31 R96 C128 C152 R318 R333 C76 R331 DZ22 D67 C155 R134 X10 R205...

Страница 68: ...2 F 22 PRECISION TIG 375 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC NOT...

Страница 69: ...any reason you do not understand the test procedures or are unable to perform the test repairs safely contact the Lincoln Electric Service Department for electrical trou bleshooting assistance before...

Страница 70: ...he input power to the Precision TIG 375 machine 2 Using the 3 8 nut driver remove the right side case cover 3 Locate the Spark Gap Assembly at the lower rear right side of the machine See Figure F 3 4...

Страница 71: ...oughout this manual If for any reason you do not understand the test procedures or are unable to perform the test repairs safely contact the Lincoln Electric Service Department for electrical trou ble...

Страница 72: ...o step 6 See Wiring Diagram 6 Unplug P22 from protection board Measure resistance at P22 See Tables 7 If readings below are OK protection board is bad 8 If readings below are wrong remote amptrol or r...

Страница 73: ...the test procedures or are unable to perform the test repairs safely contact the Lincoln Electric Service Department for electrical trou bleshooting assistance before you proceed Call 1 888 935 3877...

Страница 74: ...rrect transformer secondary voltages per Table F 3 5 Carefully check for 63 5 VAC at leads 267 to lead 268 Lead 268 is located at the background rectifier Note Lead 267 is located at resistor R8 See W...

Страница 75: ...X2 X1 TO X3 PRIMARY WINDINGS H1 TO H2 H1 TO H3 H1 TO H4 SECONDARY VOLTAGES 20 VAC 18VAC 85 VAC 75 VAC PRIMARY VOLTAGES 208 VAC 230 VAC 460 VAC NOTE If the input voltages vary the secondary voltages w...

Страница 76: ...0 NOTES F 30 PRECISION TIG 375 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master T...

Страница 77: ...eason you do not understand the test procedures or are unable to perform the test repairs safely contact the Lincoln Electric Service Department for electrical trou bleshooting assistance before you p...

Страница 78: ...igger and check for approximately 115 VAC at the solenoid leads 231A and 235 If the correct voltage is present the solenoid should activate and gas should flow 8 If voltage is present at leads 231A an...

Страница 79: ...not understand the test procedures or are unable to perform the test repairs safely contact the Lincoln Electric Service Department for electrical trou bleshooting assistance before you proceed Call 1...

Страница 80: ...y Replace the SCR Bridge Assembly See SCR Bridge Assembly Removal and Replacement 4 Repeat Step 3 testing SCR2 SCR3 and SCR4 5 To further check the SCR s functions use an SCR tester and proceed to the...

Страница 81: ...any reason you do not understand the test procedures or are unable to perform the test repairs safely contact the Lincoln Electric Service Department for electrical trou bleshooting assistance before...

Страница 82: ...Figure F 8 3 Perform the following test for all four SCRs See Figure F 8 4 Construct the circuit outline in Figure F 9 One 6V lantern battery can be used Resistor val ues are 10 The voltmeter scale s...

Страница 83: ...ter reads higher than zero the SCR is shorted 8 With switch SW 1 closed close switch SW 2 for two seconds and release The voltmeter should read 3 to 6 volts before and after switch SW 2 is released If...

Страница 84: ...8 NOTES F 38 PRECISION TIG 375 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master T...

Страница 85: ...rom a properly operating machine Note that each ver tical division represents 20 volts and that each horizontal division represents 5 milliseconds in time NOTE Scope probes connected at machine output...

Страница 86: ...l voltage and waveform checks with high frequency circuit OFF Perform High Frequency Disable Procedure This is the typical AC output voltage waveform generated from a properly operating machine Note t...

Страница 87: ...generated from a properly operating machine Note that each ver tical division represents 20 volts and that each horizontal division represents 5 milliseconds in time NOTE Scope probes connected at ma...

Страница 88: ...erform all voltage and waveform checks with high frequency circuit OFF Perform High Frequency Disable Procedure This is the typical AC output voltage waveform generated from a properly operating machi...

Страница 89: ...to work NOTE AC balance control set at Balanced position TYPICAL OUTPUT VOLTAGE WAVEFORM MACHINE LOADED TO 200 AMPS DC TIG MODE HIGH VOLTAGE HIGH FREQUENCY can damage test equipment Perform all volta...

Страница 90: ...4 F 44 PRECISION TIG 375 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC NOT...

Страница 91: ...ughout this manual If for any reason you do not understand the test procedures or are unable to perform the test repairs safely contact the Lincoln Electric Service Department for electrical trou bles...

Страница 92: ...o cut lead 7 Using a 7 16 nut driver disconnect heavy black leads S and F See Figure F 12 8 Using a 3 8 nut driver remove the screw securing the spark gap assembly box See Figure F 12 This will allow...

Страница 93: ...TRANSFORMER REMOVAL AND REPLACEMENT continued Figure F 12 3 8 Screw Leads S and F Locations Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC...

Страница 94: ...8 NOTES F 48 PRECISION TIG 375 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master T...

Страница 95: ...etailed throughout this manual If for any reason you do not understand the test procedures or are unable to perform the test repairs safely contact the Lincoln Electric Service Department for electric...

Страница 96: ...cess to the control board and its plugs 4 From left to right label and disconnect plugs J4 J5 J6 J8 J9 J10 J11 J12 See Figure F 14 5 Cut any necessary cable ties 6 Using a phillips head screwdriver re...

Страница 97: ...VAL AND REPLACEMENT continued J12 J11 J10 J9 J8 J6 J5 J4 Figure F 14 Control Board Plug Locations Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Mast...

Страница 98: ...2 F 52 PRECISION TIG 375 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC NOT...

Страница 99: ...his manual If for any reason you do not understand the test procedures or are unable to perform the test repairs safely contact the Lincoln Electric Service Department for electrical trou bleshooting...

Страница 100: ...Wiring Diagram 6 Remove the three screws mounting the Heat Sink Assembly to the Lift Bale Assembly Note placement of Insulators for reassembly 7 See SCR Replacement Procedures 8 Replace all leads baff...

Страница 101: ...or are unable to perform the test repairs safely contact the Lincoln Electric Service Department for electrical trou bleshooting assistance before you proceed Call 1 888 935 3877 DESCRIPTION This proc...

Страница 102: ...lint free cloth or paper towel 4 Inspect the mounting surfaces of each new diode Remove all burrs and wipe clean Do not use steel wool or any abrasive cleanser on the diode mount ing surface 5 Apply a...

Страница 103: ...er to the technician or machine operator and will invalidate your factory warranty For your safety and to avoid elec trical shock please observe all safety notes and precautions detailed throughout th...

Страница 104: ...COMMENDED THAT ALL NEW HARDWARE LEAF SPRING AND HOUSING BE USED FOR REASSEMBLY 2 Remove the old SCR 3 Clean the area on the heat sink around the SCR mounting surface Using a putty knife or similar too...

Страница 105: ...spring Orient the leaf spring so that it s ends are curved upward toward the bolt heads See figure F 21 Pressing on the bolt heads should pro duce a rocking motion of the spring in its housing If the...

Страница 106: ...turn 4 Tighten first cap screw 1 2 turn 5 Tighten second cap screw 1 2 turn 6 Tighten first cap screw 1 4 turn 7 Assembly now has proper clamping force 8 Perform the Active SCR Test CLAMPING PROCEDUR...

Страница 107: ...on the bolt heads should produce a rocking action of the spring in it s housing 5 Insert clamp assembly thru heat sinks Install nuts Tighten clamp nuts equally on bolts until finger tight Be sure tha...

Страница 108: ...2 F 62 PRECISION TIG 375 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC NOT...

Страница 109: ...s manual If for any reason you do not understand the test procedures or are unable to perform the test repairs safely contact the Lincoln Electric Service Department for electrical trou bleshooting as...

Страница 110: ...slot head screw drivers carefully pry the polarity switch handle from the shaft 8 Carefully peel back the lower nameplate on the case front located around the polarity switch to gain access to the pol...

Страница 111: ...RCUIT VOLTAGES MAXIMUM AC OPEN CIRCUIT VOLTAGE MAXIMUM DC OPEN CIRCUIT VOLTAGE 75 VAC 68 VDC MAXIMUM ACCEPTABLE OUTPUT VOLTAGE AT MINIMUM OUTPUT SETTINGS DC TIG Mode 2 5 Amps 20 Volts MAXIMUM ACCEPTAB...

Страница 112: ...6 F 66 PRECISION TIG 375 NOTES Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master T...

Страница 113: ...2 G 14 Control P C Board Schematic Codes above 11000 G4762 Page 3 G 15 Control P C Board Schematic Codes above 11000 G4762 Page 4 G 16 Control P C Board Schematic Codes above 11000 G4762 Page 5 G 17 C...

Страница 114: ...220A G4 218 SCR4 D1 X1 NEG SCR3 POS SCR1 SCR2 252 B 224 G4047 3 8 2002A PRECISION TIG 375 WIRING DIAGRAM L9 L10 L6 L5 L4 L13 L11 411 W 403 404 405 406 407 408 409 410 401 402 TIG OPTION PCB J1 1 3 4 5...

Страница 115: ...20A G4 218 SCR4 D1 X1 NEG SCR3 POS SCR1 SCR2 252 B 224 G4047 1 3 8 2002A PRECISION TIG 375 WIRING DIAGRAM L9 L10 L6 L5 L4 L13 L11 411 W 403 404 405 406 407 408 409 410 401 402 TIG OPTION PCB J1 1 3 4...

Страница 116: ...S INTO LOWER SWITCHED RECEPTACLE PRECISION TIG 375 WIRING DIAGRAM L9 L10 L6 L5 L4 L13 L11 411 W 403 404 405 406 407 408 409 410 401 402 TIG OPTION PCB J1 06 17 20 02 1 3 4 5 6 8 9 10 7 2 1 3 4 5 6 8 9...

Страница 117: ...VIEW OF CONNECTOR ON PC BOARD ELECTRICAL SYMBOLS PER E1537 SYMBOLES LECTRIQUES SELON E1537 S MBOLOS EL CTRICOS CONFORME A E1537 COMPONENT VALUE UNITS RESISTORS OHMS WATTS CAPACITORS MFD VOLTS 8 0F CON...

Страница 118: ...BINA DE RELEVADOR DE 12V DE AC DIODE ROUE LIBRE DIODO DE RUEDA LIBRE L1 INDUCTEUR DE SORTIE STARTER INDUCTOR DE SALIDA ESTABILADOR INDUCTEUR DE HAUTE FR QUENCE INDUCTORES DE ALTA FRECUENCIA STARTERS T...

Страница 119: ...R X14 231B 231E 236 TOROID TOROID HI FREQ 115VAC GAS 115VAC FAN 115VAC 235 260 265 266 252 253 MICRO SWITCH ON POLARITY SWITCH VOLT FEEDBACK ELECTRODE VOLT FEEDBACK WORK 265 266 252 253 MICRO SWITCH O...

Страница 120: ...BALANCE REMOTE RED GREEN GREEN GAS GREEN THERMAL YELLOW B W B W B W B W 331 332 333 B W 334 335 331 331 332 332 333 333 334 334 335 335 B W B W B W B W B W 6J10 1J10 7J10 2J10 8J10 3J10 9J10 4J10 10J1...

Страница 121: ...AGE 1 NOTE This diagram is for reference only It may not be accurate for all machines covered by this manual Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Ret...

Страница 122: ...GE 2 NOTE This diagram is for reference only It may not be accurate for all machines covered by this manual Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Retu...

Страница 123: ...GE 3 NOTE This diagram is for reference only It may not be accurate for all machines covered by this manual Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Retu...

Страница 124: ...C159 37 S16668 5 CAPACITOR CEM O 022 50V 20 C14 C127 2 S13490 25 CAPACITOR TAEL 4 7 35V 10 C15 C141 C164 3 S13490 181 CAPACITOR ALEL 22 63V 20 C22 C51 2 T11577 54 CAPACITOR CD 750PF 1000V 10 C23 C39 C...

Страница 125: ...62 PAGE 1 G 13 NOTE This diagram is for reference only It may not be accurate for all machines covered by this manual Return to Section TOC Return to Section TOC Return to Section TOC Return to Sectio...

Страница 126: ...62 PAGE 2 G 14 NOTE This diagram is for reference only It may not be accurate for all machines covered by this manual Return to Section TOC Return to Section TOC Return to Section TOC Return to Sectio...

Страница 127: ...62 PAGE 3 G 15 NOTE This diagram is for reference only It may not be accurate for all machines covered by this manual Return to Section TOC Return to Section TOC Return to Section TOC Return to Sectio...

Страница 128: ...62 PAGE 4 G 16 NOTE This diagram is for reference only It may not be accurate for all machines covered by this manual Return to Section TOC Return to Section TOC Return to Section TOC Return to Sectio...

Страница 129: ...62 PAGE 5 G 17 NOTE This diagram is for reference only It may not be accurate for all machines covered by this manual Return to Section TOC Return to Section TOC Return to Section TOC Return to Sectio...

Страница 130: ...38 C62 C72 C73 C74 C75 C79 C80 C88 C91 C104 C107 C112 C128 C134 C142 C144 C145 C146 C147 C150 C151 C152 C153 C154 C156 C159 C170 31 S16668 5 CAPACITOR CEMO 022 50V 20 C22 C51 2 T11577 54 CAPACITOR CD...

Страница 131: ...CHANGE J23 2 MFD CAPACITORS RESISTORS Ohms UNLESS OTHERWISE SPECIFIED 1A 400V ELECTRICAL SYMBOLS PER E1537 DIODES UNLESS OTHERWISE SPECIFIED GENERAL INFORMATION 1 4W 022 50V LABELS UNLESS OTHERWISE SP...

Страница 132: ...d may result in danger to the Machine Operator or Technician Improper PC board repairs could result in damage to the machine ELECTRICAL DIAGRAMS G 20 PRECISION TIG 375 PC BOARD ASSEMBLY PROTECTION M16...

Страница 133: ...ED 1 4W OF A COMPLETE ELECTRICAL SYMBOLS PER E1537 EARTH GROUND CONNECTION Graphic Graphic FRAME CONNECTION ARC STABILIZER CAPACITOR RESISTOR N A SHOW THE EXACT COMPONENTS COMMON CONNECTION AND SCREW...

Страница 134: ...e quality of the design and may result in danger to the Machine Operator or Technician Improper PC board repairs could result in damage to the machine ELECTRICAL DIAGRAMS G 22 PRECISION TIG 375 PC BOA...

Страница 135: ...ION OWNED BY THE LINCOLN ELECTRIC CO AND IS NOT TO BE REPRODUCED DISCLOSED OR USED WITHOUT THE EXPRESS PERMISSION OF UNLESS OTHERWISE SPECIFIED THE LINCOLN ELECTRIC CO CIRCUIT BOARD S WITH PUBLISHED S...

Страница 136: ...y result in danger to the Machine Operator or Technician Improper PC board repairs could result in damage to the machine ELECTRICAL DIAGRAMS PRECISION TIG 375 PC BOARD ASSEMBLY BYPASS AND CE L10882 1...

Страница 137: ...4039 PAGE 1 G 25 NOTE This diagram is for reference only It may not be accurate for all machines covered by this manual Return to Section TOC Return to Section TOC Return to Section TOC Return to Sect...

Страница 138: ...4039 PAGE 2 G 26 NOTE This diagram is for reference only It may not be accurate for all machines covered by this manual Return to Section TOC Return to Section TOC Return to Section TOC Return to Sect...

Страница 139: ...3 D4 D5 D6 D7 D9 5 S25040 5SMT DIODE SMD DUAL 0 200A 70V UFR DZ1 1 S25046 1SMT ZENER DIODE SMD 0 5W 5 1V 5 SOD123 DZ2 DZ3 2 S25046 4SMT ZENER DIODE SMD 0 5W 12V 5 SOD 123 N D J1 1 S24020 12 CONNECTOR...

Страница 140: ...4760 PAGE 1 G 28 NOTE This diagram is for reference only It may not be accurate for all machines covered by this manual Return to Section TOC Return to Section TOC Return to Section TOC Return to Sect...

Страница 141: ...4760 PAGE 2 G 29 NOTE This diagram is for reference only It may not be accurate for all machines covered by this manual Return to Section TOC Return to Section TOC Return to Section TOC Return to Sect...

Страница 142: ...4760 PAGE 3 G 30 NOTE This diagram is for reference only It may not be accurate for all machines covered by this manual Return to Section TOC Return to Section TOC Return to Section TOC Return to Sect...

Страница 143: ...1 S25020 5SMT CAPACITOR SMD CERAMIC 2700pF 50V 5 X7R S0805 C9 C27 C28 C46 4 S25020 27SMT CAPACITOR SMD CER 0 1MF 50V 20 80 Z5U S0805 C11 1 S25020 9SMT CAPACITOR SMD CERAMIC 47pF 50V 5 COG S0805 C35 C...

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